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AB-class amplifier schematic analysis & optimization
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Zero999:
I added the current limiting diodes and reran the simulation. The actual limit is a bit higher than I predicted at 130mA. Note that there's a point when the limiting kicks in where the op-amp is contributing a significant amount to the output current: see the Ix(U1:OUT) trace. It's a good idea to keep the current below this level, even if it isn't clipping, as there will be some distortion.

David Hess:

--- Quote from: Yansi on May 26, 2019, 08:23:13 am ---317 is quite low noise by itself. Doubt it will have any major contribution to the amp output noise.
--- End quote ---

It would not matter for audio applications unless the amplifier had an unusually low power supply rejection.  I just mentioned it as an example of the same idea and some applications do require lower noise than an LM317 can provide alone.
ratatax:
Thanks a lot for the simulated schematic, i'll try LTSpice to see what I can get from it
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